On my car, I use the frame rail thingy under the car to jack the car up, not that pinch weld. With my aluminum harbor freight jack, I just run the jack in until the thumbscrew for the jack handle is right by the fender. I line it up with the door/fender seam. then it's 3-4 pumps and both wheels are off the ground on that side of the car.

On my car, those are starting to deform also... It's had a rough life prior to me.

Sosideways, I don't think it would add 10 lbs total to run angle iron all the way down, stitched in 1" sections. It would make a very easy way to jack up the whole side of the car from the side. Unnecessary? Yup.

There was at one point...in fact I even had a set of the frame ladder bars here at the shop that I've simply NEVER put on the car...maybe this winter I'll finally get around to doing that as it would make for a great jacking point.

That, or I will be making jack blocks...odd that this came up as I recently was at a friends house and he just had a set welded into his civic...really neat setup!

^I purchased one of those ebay ladder bars a while back for my s14. It was a piece of junk.... When standing it up I could easily get it to bend by pressing down on it with some weight. The mounting holes were also off. I think I ended up giving it away.

I use slit/grooved hockey pucks on the pinch welds if its sitting for a while... works great if you have jack stands with flat tops and your pinch welds are still decent.
If it's just to get the wheels off the ground I go for the diff/x-member.... I don't like the idea of jacking the car up at the radiator support.... seems like those spot welds could possibly pop apart.

^I purchased one of those ebay ladder bars a while back for my s14. It was a piece of junk.... When standing it up I could easily get it to bend by pressing down on it with some weight. The mounting holes were also off. I think I ended up giving it away.

The ones I have aren't terribly bad, but I remember them not fitting 100%...I was just gonna weld them to make them fit haha.